186 BICELLARIID/. 
B. tuba, 2usk, Zc., p. 42. Aperture round, looking almost directly 
upwards ; a digitiform hollow process below the outer border, support- 
ing two or four long incurved spines ; two or three other long curved 
sub-marginal spines behind or above the aperture, none below it in 
front ; a solitary spine on the back, a short way down the cell ; 
avicularia very long, trumpet-shaped, arising from the back of the cell. 
Lyall Bay. Bass Strait, 45 fathoms. 
Genus, HALOPHILA—Gray. 
Cells continuous, attenuated downwards, much expanded upwards, 
with a large plain aperture ; unarmed. 
Australia and New Zealand only. 
H. johnstonic, Gray, Zc, ii, p. 292. Cells obliquely truncated 
above, with a short spine on the outer angle; aperture large oval; 
margin slightly thickened. Pale gray. 
Lyall Bay. Bass Strait. 
Genus, BUGULA—Oken. 
Cells elliptical (viewed behind), closely contiguous, bi-multiserial ; 
aperture very large ; margin simple, not thickened; avicularia, when 
present, pedunculate and articulated. 
B. neritina, Zinneus; Busk, lc, ~. 44. Cells quadrangular, 
lengthened, with a truncated summit, the angles projecting. 
Lyall Bay. Australia. Auckland Islands. Red Sea. Rio de 
Janeiro. 
B. dentata, Lamouroux, Busk, l.c., p. 46: Acamarchts tridentata, 
Krauss. Cells bi-serial, oblong, rounded at each end; aperture oval ; 
three marginal spines on the outer side, and one on the inner ; avicu- 
laria lateral, capitate ; ovicell superior, cucullate, blue. Gray or blue 
(Busk). 
New Zealand (Hooker, Lyall). Australia. Tasmania. South Africa. 
B. prismatica, Gray, Zc, ii, p. 292.  Zoarium rather rigid, 
compressed, dichotomously branched, erect, reddish-brown ; cells, 
distant, alternate, cylindrical; aperture, entire, produced into a denti- 
form angle at the outer margin, from which a keel descends obliquely 
to the inner and lower corner of the cell ; ovarian cells, globular, white, 
situated in a single row on the front of the zoarium. 
Motanau, Canterbury ; and Ocean Beach, Dunedin. (F.W.H.) 
Genus, MUSCARIA—Hutton. 
Cells multiserial, arranged back to back on both sides of the branches. 
New Zealand onlv. 
M. armata, ution, CMM, p. 93. Branches robust, flattened ; 
cells oval, convex, arranged’ in longitudinal rows which are divided by 
